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Finding the Fourth Proportional to 13,685.76, 18,877.46 and 8,378.64

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Solution

The fourth proportional to 13,685.76, 18,877.46 and 8,378.64 is: 11,557.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.76 : 18,877.46 = 8,378.64 : x
  2. Step 2: Convert to fraction form
    13,685.76/18,877.46 = 8,378.64/x
  3. Step 3: Cross multiply
    13,685.76x = 18,877.46 × 8,378.64
  4. Step 4: Simplify right side
    13,685.76x = 158,167,399.56
  5. Step 5: Solve for x
    x = 158,167,399.56/13,685.76
  6. Step 6: Final answer
    x = 11,557.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.